SR USA class

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Southern Railway USA class [1]
KESR 22 Maunsell (Southern 62).JPG
USA class locomotive No.65 in Southern Railway livery
Power type Steam
Builder Vulcan Iron Works, USA (13)
H. K. Porter, Inc., USA (1)
Model S100
Build date 1942-43
Configuration 0-6-0T
UIC classification Ct
Gauge 4 ft 8 12 in (1,435 mm)
Driver diameter 54 in (1.372 m)
Wheelbase 10 ft 0 in (3.05 m)
Length 29 ft 8 in (9.04 m)
Locomotive weight 41 short tons 9 hundredweights (37.6 t)
Fuel type Coal
Fuel capacity 17.8 short hundredweight (0.81 t)
Water capacity 1,000 imp gal (4,500 l; 1,200 US gal)
Boiler pressure 210 psi (1.45 MPa)
Cylinders Two, outside
Cylinder size 16 12 in × 24 in (419.1 mm × 609.6 mm)
Valve gear Walschaerts
Valve type 8 inches (203 mm) piston valves
Tractive effort 21,600 lbf (96.08 kN)
Power class BR: 3F
Number in class 14 (plus one bought for spares)
Retired 1962–1967

The SR USA class were ex-United States Army Transportation Corps S100 Class steam locomotives purchased by the Southern Railway after the end of the Second World War.

Construction history[edit]

Thirteen out of the Southern's 15 locomotives (14 for traffic plus one for spares) were built at the Vulcan Iron Works in Wilkes-Barre, Pennsylvania in 1942 to the design specifications of the USATC by Col. Howard G. Hill. The remaining two were built by H. K. Porter, Inc of Pittsburgh.[2] Overall, 382 of the class had been ordered from Davenport Locomotive Works of Davenport, Iowa, H. K. Porter and Vulcan Iron Works. [1] They were shipped to Great Britain in 1943 and stored awaiting the invasion of Mainland Europe, after which many were shipped to Europe, but others, including those purchased, had hardly been used and were lying around in dumps awaiting disposal.

The key to their success, after being acquired by the Southern Railway, was their short wheelbase, which was able to negotiate the tight curves found at Southampton Docks. They were also powerful, able to haul heavy freight trains as well as full-length passenger trains in the harbour area.[1]

After the war they replaced ageing B4, D1 and E1 class tanks in Southampton Docks at the recommendation of Oliver Bulleid. Steam heating, vacuum ejectors, sliding cab windows, additional lamp irons and new cylinder drain cocks had to be added for them to operate on British metals.[1] More modifications became necessary once the locomotives started to enter traffic, including large roof-top ventilators, British-style regulators (as built they had US-style pull-out ones), three rectangular cab-front lookout windows, extended coal bunkers, separate steam and vacuum brake controls and wooden tip-up seats. This meant that it took until November 1947 for the entire class to be ready for work.[1]

Others found industrial uses in Great Britain with the National Coal Board, Longmoor Military Railway and Austin Motors.

Livery and numbering[edit]

War Department and Southern[edit]

Livery during the Second World War was USATC black with white numbering and lettering 'Transportation Dept.' on the watertank sides. Prior to nationalisation, the locomotives were painted in Southern black livery with 'Southern' in "Sunshine Yellow" lettering.

Thirteen of the locomotives were re-numbered 61-73 by the Southern; 4326 retained its War Department number instead of being renumbered 74, while the locomotive used for spares was not numbered.

Original drawings for the S100, dated 29 November 1941.

Post-1948 (nationalisation)[edit]

The class was allocated the BR power classification 3F, whilst the lettering on the tank sides was changed to 'British Railways' during 1948 as a transitional measure. Finally, the class was outshopped in BR Departmental Malachite livery, with BR crests on the watertank sides and numbers on the cab sides.

Under the BR Standard numbering system they were renumbered 30061-30074.

Operational details[edit]

They were used for shunting in Southampton Docks and replaced the elderly LSWR B4 Class 0-4-0T tank locomotives, many of which required new boilers. Although they were excellent performers, their austerity construction meant that they deteriorated very quickly.[1] Their steel fireboxes rusted and fatigued quickly, and this came to a head in 1951 when several had to have new fireboxes constructed.[1]

Telephones were installed on the footplate to improve communication on the vast network of sidings at Southampton.[1] They were replaced by British Rail Class 07 diesel-electric shunters, introduced in 1962. Nine remained in departmental use within the military and National Coal Board, and five survived until the end of steam on the Southern Region, in 1967, in departmental use at workshops and loco sheds.[1]


Four examples have been preserved in England:

plus two ex-JŽ class 62 locomotives, built to a broadly similar design, which are to be converted to British USA Class specifications.

In fiction[edit]

An engine of this prototype was featured in the Thomas & Friends TV Series as Rosie who was introduced in Series 10. Also, the Goods Engine from TUGS, is a modified version of this type of locomotive.


  1. ^ a b c d e f g h i Longworth, Hugh: British Railway Steam Locomotives: 1948-1968 (Oxford Publishing Company: Oxford, 2005) ISBN 0-86093-593-0
  2. ^ Bradley, D.L.: Locomotives of the Southern Railway: Part 1. (Railway Correspondence and Travel Society: London, 1975) ISBN 0-86093-593-0

Further reading[edit]

  • Sprenger, J. Howard; Robertson, K.J.; Sprenger, C.C. (23 July 2004). The Story of the Southern USA Tanks. Southampton: KRB Publications. ISBN 978-0-9544859-3-1. 
  • Ian Allan ABC of British Railways Locomotives, winter 1959-60 edition

External links[edit]